Weighing round bales

ABSTRACT

Embodiments relate to weighing a bale formed by a round baler. One or more load cells, but not including load cells at each support of the baler, are used to obtain a measurement of the baler containing the bale and a measurement of the baler empty. Factors related to the slope of the surface on which the baler is located, the size of the bale, and the shape of the bale are used to adjust the measured weight of the bale.

This divisional application claims priority under 35 U.S.C. §120 fromU.S. patent application Ser. No. 13/725,117, now U.S. Pat. No.9,297,688, filed on Dec. 21, 2012 by John H. Posselius, Robrecht M. K.Dumarey, Bart M. A Missotten, Didier Verhaeghe, Kevin M. Smith, andDouglas S. Fitzkee with the same title, the full disclosure of which ishereby incorporated by reference.

TECHNOLOGY FIELD

The present invention relates generally to weighing round bales, andmore particularly to a weighing system incorporated within a round balerfor the weighing of a bale formed therein.

BACKGROUND

For many years agricultural balers have been used to consolidate andpackage crop material to facilitate the storage and handling of the cropmaterial for later use. Usually, a mower-conditioner cuts and conditionsthe crop material for windrow drying in the sun. When the cut cropmaterial is properly dried, a baler, for example a round baler, travelsalong the windrows to pick up the crop material and form it intocylindrically-shaped round bales.

More specifically, pickups of the baler gather the cut and windrowedcrop material from the ground, then convey the cut crop material into abale-forming chamber within the baler. A drive mechanism operates toactivate the pickups, augers, and a rotor of the feed mechanism. Aconventional baling chamber may include a pair of opposing sidewallswith a series of belts that rotate and compress the crop material into acylindrical shape.

When the bale has reached a desired size and density, a wrapping systemmay wrap the bale to ensure that the bale maintains its shape anddensity. For example, a net may be used to wrap the bale of cropmaterial. A cutting or severing mechanism may be used to cut the netonce the bale has been wrapped. The wrapped bale may be ejected from thebaler and onto the ground by, for example, raising a tailgate of thebaler. The tailgate is then closed and the cycle repeated as necessaryand desired to manage the field of cut crop material.

A weighing system incorporated in the baler that provides weightmeasurements of the formed bale is desired. Such a system is desirableto eliminate use of a separate scale, while also providing weightmeasurements to the operator of the baler and customers soon aftercompletion of forming the bale.

This document describes an apparatus and processes for weighing roundbales.

SUMMARY

Embodiments of the present invention provide methods for weighing a baleformed by a round baler, and a round baler with a processing unitcoupled to one or more load sensors and one or more inclinometers fordetermining a weight of a bale.

In one embodiment, a method of weighing a bale formed by a balerincludes: obtaining one or more bale weight measurements, with one ormore load sensors, of the baler with a formed bale contained therein;obtaining one or more empty baler weight measurements, with the one ormore load sensors, of the baler empty; and determining, by a processingunit in communication with the one or more load sensors, a correctedbale weight by adjusting a first bale weight, the first bale weight afunction of the one or more bale weight measurements and the one or moreempty baler weight measurements; wherein the first bale weight isadjusted based upon one or more of (i) one or more slopes on a surfaceon which the baler is positioned; (ii) a size of the bale; and (iii) ashape of the bale.

According to an embodiment, a round baler is comprised of: a main framewith a main support beam on which a pair of wheels are rotatablyaffixed, each wheel comprising a wheel axle, the main frame including abale forming chamber in which a bale is formed; a tailgate pivotallyconnected to the main frame, the tailgate configured to pivot open todischarge a formed bale; at least one load sensor, each of the at leastone load sensor positioned at a respective wheel axle for measuring aweight force exerted thereon, wherein the at least one load sensorobtains the following measurements: one or more bale weight measurementsof the baler with a formed bale contained therein; and one or more emptybaler weight measurements of the baler empty; and a processing unitcoupled to the at least one load sensor, the processing unit configuredto calculate a weight of the bale by: determining a corrected baleweight by adjusting a first bale weight, the first bale weight afunction of the one or more bale weight measurements and the one or moreempty baler weight measurements; wherein the first bale weight isadjusted based upon one or more of (i) one or more slopes on a surfaceon which the baler is positioned; (ii) a size of the bale; and (iii) ashape of the bale.

According to an embodiment, the one or more bale weight measurements andthe one or more empty baler weight measurements are obtained at fewerthan each support position of the baler.

According to an embodiment, the one or more bale weight measurements areobtained during a wrap cycle of the formed bale.

According to an embodiment, the one or more empty baler weightmeasurements are obtained during a tailgate close cycle.

According to an embodiment, the one or more slopes comprises one or moreof a front-to-back angle and a side-to-side angle of the baler.

A first of the one or more load sensors is positioned at a first wheelaxle of the baler, and a second of the one or more load sensors ispositioned at a second wheel axle of the baler, in one embodiment. Inthis embodiment, the front-to-back angle and the side-to-side angle areobtained with respective inclinometers, the inclinometers incommunication with the processing unit. According to various aspects,the corrected bale weight is determined by adjusting the first baleweight based upon the front-to-back angle and the side-to-side angle ofthe baler and the size of the bale; and wherein the size of the bale isa function of a center of gravity location of the bale.

In another embodiment, the one or more load sensors comprises a singleload sensor positioned at one of a first wheel axle or a second wheelaxle of the baler. The front-to-back angle is obtained with aninclinometer in communication with the processing unit, and theside-to-side angle is determined based upon the empty baler weightmeasurements in which a tailgate of the baler is in two known positions.The corrected bale weight is determined by adjusting the first baleweight based upon the front-to-back angle and the side-to-side angle ofthe baler, the size of the bale, and the shape of the bale; wherein thesize of the bale is a function of a center of gravity location of thebale; and wherein the shape of the bale is a function of the density ofthe bale at more than one bale shape sensor positioned in the baler.

According to an embodiment, a display interface connected to theprocessing unit is configured to display on a monitor an indication ofthe corrected bale weight.

In another embodiment, a method of weighing a bale formed by a balercomprises: obtaining one or more bale weight measurements, with one ormore load sensors each positioned at a respective wheel axle of thebaler, of the baler with a formed bale contained therein; obtaining oneor more empty baler weight measurements, with the one or more loadsensors, of the baler empty; and determining, by a processing unit incommunication with the one or more load sensors, a corrected bale weightby adjusting a first bale weight of the bale, the first bale weight afunction of the one or more bale weight measurements and the one or moreempty baler weight measurements based upon a front-to-reverse slope anda side-to-side slope of a surface on which the baler is positioned and acorrection factor based upon one or more of (i) a size of the bale; and(ii) a side-to-side shape of the bale.

In an embodiment, a tailgate closing switch in communication with thetailgate is configured to indicate when the tailgate is closed. In thisembodiment, the one or more empty baler weight measurements are obtainedduring a tailgate close cycle.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other aspects of the present invention are bestunderstood from the following detailed description when read inconnection with the accompanying drawings. For the purpose ofillustrating the invention, there is shown in the drawings embodimentsthat are presently preferred, it being understood, however, that theinvention is not limited to the specific instrumentalities disclosed.Included in the drawings are the following Figures:

FIG. 1 is a cutaway side elevational view of an exemplary round baler inwhich the present invention may be employed;

FIGS. 2A, 2B, and 2C show a side, top, and rear view, respectively, ofan exemplary round baler;

FIGS. 3A-7B show side and rear views of measurement configurations ofthe exemplary round baler, according to embodiments;

FIG. 8 illustrates a flowchart of an exemplary method of weighing around bale;

FIG. 9 illustrates a flowchart of another exemplary method of weighing around bale; and

FIG. 10 is a block diagram of components utilized for weighing a roundbale, according to an embodiment.

DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

Embodiments of the present invention relate to weighing a round baleformed by a round baler. In addition to utilizing one or more load cellsor sensors to obtain a measurement of the baler containing the bale,factors related to adjusting the weight based on angles of inclinationof the baler and the size, shape, and location of the bale are takeninto account to achieve an accurate bale weight determination.

Agricultural balers, such as round balers, are well known in theagricultural industry, and the instant invention can be used withsubstantially any of such machines. Reference is made, for example, toU.S. Pat. Nos. 6,877,304; 6,688,092; 6,644,006; and 6,295,797 thatillustrate such balers, the disclosures of which are incorporated hereinby reference in their entirety. For illustrative purposes, details of anexemplary round baler in which the features of the present invention maybe used are disclosed in and will be described here in part withreference to U.S. Pat. No. 5,581,976, which is also hereby incorporatedby reference in its entirety.

FIG. 1 depicts an exemplary agricultural round baler, generallydesignated 10, in which embodiments of the present invention may beemployed. As previously noted, crop in the field is usually arranged ina windrow as it is engaged by the baler 10 being pulled along thewindrow of cut crop material by a tractor (not shown).

FIG. 1 shows a fixed chamber round baler 10 having a wrapping system forwrapping a cylindrical package of crop material (not shown) formed in around baler 10. More particularly, the wrapping system of baler 10comprises a net dispensing assembly 11 and a cutting assembly 12 forcutting web material, such as net, issued from a supply roll 13.

As shown, round baler 10 includes a main frame 14 with a main supportbeam 15 on which a pair of wheels 16 (only one shown) are rotatablyaffixed. The main frame includes a pair of side walls between which acylindrical bale forming chamber extends. For the purposes of clarityonly one wall 17 is shown in FIG. 1 and the elements mounted inwardlythereof are shown in full lines for clarity, which is an approach notuncommon in the descriptions in patents. For illustrative purposesreference letter B is used to designate a bale, shown in cross sectionin the chamber.

Baler 10 also includes a tongue 18 extending from the forward portion ofmain frame 14 for conventional connection to a tractor (not shown).Pivotally connected to the sidewalls of main frame 14 by a pair of stubshafts 20 is tailgate 21 which may be closed (as shown in FIG. 1) duringbale formation or pivoted open about stub shafts 20 to discharge acompleted bale. The tailgate includes tailgate walls 22 coextensive withside walls 17. A pickup assembly 23 mounted on main frame 14 in asuitable manner includes a plurality of fingers or tines 24 moveable ina predetermined path to lift crop material from the ground, generallydepicted by direction arrow a, and deliver it rearwardly (arrow b)toward a transverse inlet 25 in the chamber defined by a floor roll 26and a transverse stripper roll 27, both of which rolls are rotatablysupported on mainframe 14 between sidewalls 17.

As shown, the bale forming chamber is defined primarily by an apronassembly 28 comprising a pair of support chains 30 mounted to travelalong a continuous path, the inner run of which is defined on sidewalls17 and tailgate walls 22 by front and rear sections 31, 32 of acontinuous chain guide track that separates at a point of track adjacentthe stub shaft 20 during bale discharge. The apron further comprises aplurality of parallel tubular crop engaging slats 33 extending betweenchains 30 to provide a cage-like periphery of the cylindrically shapedchamber. Radially outward of the inner run of apron assembly 28 arefront and rear sections 34, 35 of continuous cylindrical bale chamberwall. These sections, also separable during bale discharge, are mountedbetween side walls 17 and tailgate walls 22, respectively, formaintaining integrity between the outer and inner runs of chain 30.Operatively engaged with chain 30 are drive sprocket 36 mounted betweensidewalls 17, idler sprockets 37 also mounted between sidewalls 17 onshaft 20, and idler sprocket 38 mounted between tailgate walls 22. Aconventional chain drive system for drive sprocket 36 is provided viaappropriate coupling to gearbox 40 in a conventional manner,diagrammatically depicted in phantom outline outwardly of sidewall 17.The bale forming chamber is further defined by the outer conveyingsurfaces of floor roll 26 and stripper roll 27, both of which are drivenin a direction opposite that of the bale chamber direction byconventional drive means appropriately coupled to gear box 40. In FIG.1, floor roll 26 receives bale material at its forward surface, movingthe bale material upward and rearward, clockwise as shown in FIG. 1.Bale material leaves the floor roll 26 and enters the bale chamber whichrotates moving the bale material from a lower position, rearward andupward in a circular motion, counterclockwise as shown in FIG. 1. Theserolls 26, 27 may be provided with ribs 41, 42 to enhance their abilityto convey crops in the chamber as a bale is being formed. Other forms ofaggressive surface structure may be used to accommodate various types ofcrops and conditions.

FIGS. 2A, 2B, and 2C show a side, top, and rear view, respectively, ofthe exemplary round baler 10, in a simplified form for purposes ofdescribing the bale weighing process of the present invention. Shown arethe main frame 14, the tailgate 21, the tongue 18, the main support beam15 on which the pair of wheels 16 (16 a, 16 b) are affixed, and acoupling point 220 at which the baler 10 is coupled to a tractor. A bale200, formed by operation of the baler 10 as described above, is alsoshown in FIGS. 2A, 2B, and 2C.

It is desired by operators to accurately determine the weight of thebale 200 without moving the bale 200 to a special location forperforming such a measurement. It is also desirable to obtain weightmeasurements without using load sensors at each supporting point of thebaler 10 (i.e., each wheel and the hitch). Thus, various featuresrelating to the bale 200 and/or to the baler 10 are taken into accountto determine a correction factor to apply to weight measurements takenof the baler 10 with the bale 200 contained therein.

According to an embodiment, since the bale weighing process is desirablyperformed on-site (e.g., the field on which the bale 200 is formed) whenthe baler 10 is stationary, features of the site are taken into accountwhen determining the weight of the bale 200. In particular, the groundon which the baler 10 is positioned may not be level; the ground may beinclined an angle “a” with respect to a front-to-reverse direction ofthe baler 10 and an angle “b” with respect to a side-to-side directionof the baler 10. If the weight of the baler 10 is measured with one ormore load cells (but not including a load cell at each support point ofthe baler 10), for example, the measured weight of the baler 10 may notbe accurate if the baler 10 is inclined longitudinally(front-to-reverse) or side-to-side. Moreover, according to furtherembodiments, the size and shape of the bale 200 may affect the measuredweight of the baler 10 obtained using a load cell. In particular, if theshape of the bale is not uniform, a reading on one or more load cellsmay not accurately represent the weight of the bale 200. Thus, toaccurately determine the weight of a bale 200 contained within the baler10, a weight measurement with a load cell cannot simply be taken;instead, the effect of the angle a and/or angle b, as well as the sizeand shape of the bale 200, have to be taken into account.

According to embodiments, a correction factor, taking into account howthe weight is changed based on either or both angle a and angle b andtaking into account the size and/or shape of the bale 200 within thebaler 10, is determined. This correction factor is then used to adjust aweight measurement of the bale 200, which is the difference between themeasured weight of the baler 10 with the bale 200 and the weight of thebaler 10 empty.

With reference to FIGS. 3A through 4, two load sensors or cells 310 and312 and two inclinometers 320 and 322 are incorporated into the baler 10to determine the center of gravity of the baler 10 as well as that ofbales 200 formed therein. The load cells 310, 312 measure the weightforce exerted thereon; the inclinometer 320 measures the inclination ofthe baler 10 in a longitudinal direction (i.e., angle a, front-to-backof the baler 10); and the inclinometer 322 measures the inclination ofthe baler in the lateral direction (i.e., angle b, side-to-side). Theload cells 310, 312 may be various types of load cells or sensorsavailable in the field, such as, for example, those produced byDigi-Star that function to measure the weight force and interface themeasured weight with one or more display and/or one or more processingunits. The inclinometers may be various types of inclinometers availablein the field that function to measure the slope or angle of inclinationand interface with one or more display and/or one or more processingunits. The load cells 310, 312 may be positioned at the wheel axles ofthe baler 10 at wheels 16 a, 16 b. Alternatively, one of the load cells310, 312 may be positioned at the hitch or coupling point 220 of thebaler 10. The inclinometers 320 and 322 may be positioned at anylocation on the baler, for example each may be positioned at thecoupling point 220 of the baler 10.

FIGS. 3A and 3B show a side and rear view, respectively, of a firstmeasurement configuration of the baler 10. In the first measurementconfiguration, the bale 200 is formed and contained within the baler 10,the baler 10 is stationary, and the tailgate 21 is closed. The loadcells 310, 312 measure the weight force Fx1, Fx2 exerted thereon, withthe total weight force being the sum of the two weight forces. Theinclinometer 320 measures the angle a that the baler 10 is inclined inthe longitudinal direction. The inclinometer 322 measures angle b in thelateral direction. The measurements may be obtained during a wrap cycleof the formed bale 200 or at another time when the bale 200 is formed.

FIGS. 4A and 4B show a side and rear view, respectively, of a secondmeasurement configuration of the baler 10. In the second measurementconfiguration, the bale 200 is removed from the baler 10, the baler 10is stationary, and the tailgate 21 is closed or nearly closed (i.e.,open a few degrees). The load cells 310, 312 measure the weight forceFz1, Fz2 exerted thereon, with the total weight force being the sum ofthe two weight forces. The inclinometer 320 measures the angle a thatthe baler 10 is inclined in the longitudinal direction. The inclinometer322 measures angle b in the lateral direction.

In order to determine the load cell reaction due to the bale 200, Fz1and Fz2 are subtracted from values Fx1 and Fx2. The resultant valuesequals the load cell reaction due to the bale:F=(Fx1+Fx2)−(Fz1+Fz2).

In order to determine the actual bale weight, a correction factor needsto be applied. This correction factor includes adjusting for the slope(angles a and b) and adjusting for the center of gravity of the bale inthe baler. The slope correction factor uses simple trigonometricfunctions to determine the actual reaction load reaction. For instance:F _(slope) =F/cos a/cos b.

In addition to using the load cells 310 and 312 and the inclinometers320 and 322 to measure the weight of the bale 200, the size and/or theshape of the bale 200 may be used to determine a size/shape correctionvalue to further adjust the weight of the bale 200. As the bale 200grows, the center of the bale 200 moves rearward in relation to thebaler frame 14. Consequently, when performing weight measurements withone or two load cells, it is important to know the center of gravitylocation of the bale. The center of gravity location of the bale 200determines the weight distribution of the bale 200 on the support 220and the wheels 16 a and 16 b. As the bale 200 grows in size, more of thebale weight is distributed at wheels 16 a and 16 b. According to anembodiment, from previously collected data, a relationship may bedetermined to quantify the center of gravity location of the bale 200versus the size of the bale 200 in the a direction extending towards thefront of the baler 10. This information is used to determine thepercentage of the bale's weight on the axle of the baler at wheels 16 a,16 b, which is used to determine a correction factor to be applied tothe measured weight.

Similarly, the bale shape (e.g., cylindrical or conical) may also beactively measured on the baler 10 to adjust the end weight value of thebale 200. Sensors incorporated within the bale frame 14 may be used todetermine the density of the bale 200 at different locations in the balechamber (e.g., forward portion and end portion of the bale chamber),with the density serving as an indicator of the shape of the bale 200.

The actual bale weight is then determined by adjusting F_(slope) by thebale center of gravity location factor B_(COG). This factor determinesthe percent weight of the bale on the load cells based on diameter andslope, so that:Bale Weight=F _(slope) /B _(COG).

According to an additional embodiment, and as an alternate solution toutilizing the correction factor as described above, a single load cell610 may be incorporated into the baler 10 to determine the weight ofbales formed therein. The load cell 610 may be positioned at either ofthe wheel axles of the baler 10 at wheels 16 a, 16 b.

FIGS. 5A and 5B show a side and rear view, respectively, of a firstsingle load sensor measurement configuration of the baler 10. In thisconfiguration, the bale 200 is formed and contained within the baler 10,the baler 10 is stationary, and the tailgate 21 is closed. The load cell610 measures the weight force Fx exerted thereon. This may be done, forexample, during the wrap cycle of the baler 10.

FIGS. 6A and 6B show a side and rear view, respectively, of a secondsingle load sensor measurement configuration of the baler 10. In thisconfiguration, the bale 200 is removed from the baler 10, the baler 10is stationary, and the tailgate 21 is opened. The load cell 610 measuresthe weight force Fy exerted thereon.

FIGS. 7A and 7B show a side and rear view, respectively, of a thirdsingle load sensor measurement configuration of the baler 10. In thismeasurement configuration, the bale 200 is removed from the baler 10,the baler 10 is stationary, and the tailgate 21 is closed or nearlyclosed. The load cell 610 measures the weight force Fz exerted thereon.For all 3 measurement configurations, an inclinometer 620 measures thebaler longitudinal orientation (angle a, front-to-back).

The weight forces Fy and Fz can be used to determine the angle b withthe use of basic trigonometric functions. This is possible as a knownmass (tailgate 21) is being moved from one known tailgate position(open) to a second known tailgate position (closed). Once angle b isdetermined, the bale weight can be determined in a similar manner as thefirst embodiment. Since only one load cell is used in this embodiment,an additional correction factor is needed based on side-to-side baleshape. This is needed as, for example, a bale that is not cylindrical,rather it is conical, may have more or less than 50% of its weight onthe load cell. This bale shape correction factor (B_(shape)) isdetermined by bale shape sensors on the bale. The resultant bale weightcalculations are:F=Fx−Fz;F _(slope) =F/cos a/cos b;andBale Weight=F _(slope) /B _(COG) /B _(shape).

In the example measurement configurations described above, the weight ofthe baler 10 empty may be based on measurements when the tailgate 21 hasmoved to the open position and/or when the tailgate 21 has moved to theclosed position. This requires that the baler remain stationary for somemoments after the tailgate has closed to get an acceptable empty balerweight. In another embodiment, the empty baler weight is based onmeasurements taken during the closing cycle of the tailgate 21, whichprovides uniform data as the tailgate 21 is moving through a controlleddescent. A tailgate closed switch incorporated in and in communicationwith the tailgate 21 indicates when the tailgate 21 is closed. Accordingto this embodiment, the empty baler weight is determined based on dataobtained during a set amount of time prior to the tailgate switchclosing. Since noise is generated in the data at essentially the sametime the tailgate switch closes, the useable data may be in a range ofapproximately 2 seconds to 0.5 seconds prior to the tailgate closing,for example. Other ranges of data may also be used.

FIG. 8 illustrates a flowchart of an exemplary method of weighing around bale 200 utilizing the two load sensors or cells 310 and 312 andthe inclinometers 320 and 322 as described above with reference to themeasurement configurations of FIGS. 3A-4B.

At 1310, at a first measurement configuration of the baler 10 in whichthe bale 200 is formed and the tailgate 21 of the baler 10 is closed, aweight measurement Fx1, Fx2 of the baler 10 is obtained at the two loadcells 310 and 312 and angle measurements a and b of theforward-to-reverse incline and side-to-side incline of the baler 10 areobtained with the inclinometers 320 and 322 (see FIGS. 3A and 3B).

At 1320, when the baler 10 is in a second measurement configuration inwhich the bale 200 is removed from the baler 10 and the tailgate 21 isclosed or nearly closed, a second measurement is obtained with the twoload cells 310 and 312 and the inclinometers 320 and 322 (see FIGS. 4Aand 4B). The second measurement includes the weight Fz1, Fz2 of thebaler 10 and the angles a and b of the forward-to-reverse andside-to-side incline of the baler 10. According to an embodiment, theempty baler weight is based on measurements taken during the closingcycle of the tailgate 21.

At 1330, a correction factor is determined. The correction factor is afunction of the forward-to-reverse and side-to-side incline angles a andb of the baler 10, as well as a percentage of the bale weight determinedto be on the load cells 310 and 312. This factor is based on bale sizeand baler orientation.

At 1340, a weight of the bale 200 is determined by adjusting the weightmeasurement Fx1, Fx2 of the baler. The correction factor is used toadjust the weight measurement.

At 1350, an indication of the weight of the bale 200 may be displayed toan operator of the baler 10 via a monitor in the cab of the baler 10,for example.

At 1360, following 1310, after the weight measurement Fx1, Fx2 is taken,the bale 200 may be removed and the close cycle of the tailgate 21 maybegin. The load cells 310 and 312 and/or the inclinometers 320 and 322may provide an indication (i.e., signal) to a processing device that themeasurement is complete, thereby indicating that the tailgate 21 shouldopen and that the formed bale 200 should be ejected, the operation ofwhich may be controlled by a processing device. Alternately, the baler10 may wait a predetermined amount of time before moving to the secondmeasurement configuration after the bale 200 is formed and/or wrapped.

FIG. 9 illustrates a flowchart of another exemplary method of weighing around bale 200 utilizing the load sensor or cell 610 and theinclinometer 620 as described above with reference to the measurementconfigurations of FIGS. 5A-7B.

At 1410, when the bale 200 is formed and the tailgate 21 of the baler 10is closed, a weight measurement Fx of the baler 10 is obtained at thesingle load cell 610, as is the forward to reverse baler angle a withthe inclinometer 620 (see FIGS. 5A and 5B).

At 1420, when the bale 200 is removed from the baler 10 and the tailgate21 is opened, a first test measurement is obtained with the load cell610 (see FIGS. 6A and 6B). The first test measurement includes theweight Fy of the baler 10.

At 1430, when the bale 200 is removed from the baler 10 and the tailgate21 is closed or nearly closed, a second test measurement is obtainedwith the load cell 610 to obtain the weight Fz of the baler 10 (seeFIGS. 7A and 7B).

At 1440, angle b (the side-to-side incline of the baler 10) isdetermined as a function of the first and second test measurements, Fyand Fz, respectively, of the weight of the baler 10.

At 1450, the known weight of the empty baler 10 is subtracted from Fx toobtain the weight of the bale 200 on the load cell, F. The known weightof the empty baler 10 corresponds to Fz. Angles a and b are used toadjust the weight measurement F of the bale 200, thereby taking intoaccount effects that angles a and b have on the weight measurement. Thecenter of gravity location of the bale 200 and the bale shape areapplied to further adjust the bale weight measurement.

At 1460, an indication of the weight of the bale 200 may be displayed toan operator of the baler 10 via a monitor in the cab of the baler 10,for example.

At 1470, following 1410, after the weight measurement Fx is taken, theload cell 610 and/or inclinometer 620 may provide an indication (i.e.,signal) to a processing device that the measurements are complete,thereby indicating that the tailgate 21 should be opened and the formedbale 200 should be ejected, the operation of which may be controlled bya processing device. Alternately, a predetermined amount of time maypass before the opening of the tailgate 21 and the ejection of the bale200.

At 1480, following 1420, after the weight measurement Fy is taken, thetailgate 21 is moved to a closed position. The load cell 610 and/orinclinometer 620 may provide an indication (i.e., signal) to aprocessing device that the measurement is complete, thereby indicatingthat the tailgate 21 should begin closing, the operation of which may becontrolled by a processing device. Alternately, a predetermined amountof time may pass after the bale 200 is ejected from the baler 10 beforethe tailgate 21 begins closing.

FIG. 10 is a block diagram of the components for weighing a bale 200. Apower unit 1110 may provide power to one or more of the othercomponents, including the load cells 310, 312, and 610; theinclinometers 320, 322, and 620; an electronic control unit (ECU) 1120;a monitor 1130; a tailgate latch sensor 1140; and bale shape/sizesensors 1150.

The ECU 1120 may be a processing device, computing device, processor, orthe like for performing calculations and operations described herein.The ECU 1120 may perform calculations related to the correction factor,angles a and b, and the weight of the bale 200. The ECU 1120 may alsooperate to move the tailgate 21 to the various positions for obtainingthe measurements Fx1, Fx2, Fy1, Fy2, Fz1, and Fz2; Fx, Fy, and Fz; andthe forward-to-reverse angle a and side-to-side angle b of the baler 10.

The ECU 1120 interfaces with the load cells 310, 312, and 610; theinclinometers 320, 322, and 620; the monitor 1130; the tailgate latchsensor 1140; the bale shape/size sensors 1150; and the power unit 1110.The ECU 1120 may also interface with one or more memory devices (notshown) such as read only memory (ROM), random access memory (RAM), andone or more optional non-transitory memory devices such as, for example,an external or internal DVD drive, a CD ROM drive, a hard drive, flashmemory, a USB drive, or the like. The memory devices may be configuredto include individual files and/or one or more databases for storing anysoftware modules, instructions, or data. The memory devices may storepredetermined information and date related to the correction factors,for example.

Program instructions, software, or interactive modules for performingany of the functional steps associated with the processes as describedabove may be stored in the ROM and/or the RAM. Optionally, the programinstructions may be stored on a tangible computer readable medium suchas a compact disk, a digital disk, flash memory, a memory card, a USBdrive, an optical disc storage medium, such as a Blu-Ray™ disc, and/orother recording medium.

A display interface may permit information from the ECU 1120 to bedisplayed on the monitor 1130 in audio, visual, graphic, and/oralphanumeric format. For example, the monitor 1130 may be positioned ina cab utilized by the operator of the baling process so that theoperator may safely and conveniently see the information during andafter operation, such as the weight measurements of the bale 200.Communication with external devices may occur using variouscommunication ports that may be attached to one or more communicationsnetworks, such as the Internet or a local area network, or directly to aportable computing device such as a notebook computer. An interface mayallow for receipt of data from input devices such as a keyboard, amouse, a joystick, a touch screen, a remote control, a pointing device,a video input device, an audio input device, and the like accessible bythe operator.

Although the present invention has been described with reference toexemplary embodiments, it is not limited thereto. Those skilled in theart will appreciate that numerous changes and modifications may be madeto the preferred embodiments of the invention and that such changes andmodifications may be made without departing from the true spirit of theinvention. It is therefore intended that the appended claims beconstrued to cover all such equivalent variations as fall within thetrue spirit and scope of the invention.

We claim:
 1. A round baler comprising: a main frame with a main supportbeam on which a pair of wheels are rotatably affixed, each wheelcomprising a wheel axle, the main frame including a bale forming chamberin which a bale is formed; a tailgate pivotally connected to the mainframe, the tailgate configured to pivot open to discharge a formed bale;at least one load sensor, each of the at least one load sensorpositioned at a respective wheel axle for measuring a weight forceexerted thereon, wherein the at least one load sensor obtains thefollowing measurements: one or more bale weight measurements of thebaler with a formed bale contained therein; and one or more empty balerweight measurements of the baler empty; and a processing unit coupled tothe at least one load sensor, the processing unit configured tocalculate a weight of the bale by: determining a corrected bale weightby adjusting a first bale weight, the first bale weight a function ofthe one or more bale weight measurements and the one or more empty balerweight measurements; wherein the first bale weight is adjusted basedupon one or more of (i) one or more slopes on a surface on which thebaler is positioned; (ii) a size of the bale; and (iii) a shape of thebale, wherein the one or more slopes comprises one or more of afront-to-back angle and a side-to-side angle of the baler; inclinometersin communication with the processing unit configured to obtain thefront-to-back angle and the side-to-side angle, wherein a first of theone or more load sensors is positioned at a first wheel axle of thebaler, and a second of the one or more load sensors is positioned at asecond wheel axle of the baler.
 2. The round baler of claim 1, whereinthe one or more bale weight measurements and the one or more empty balerweight measurements are obtained at fewer than each support position ofthe baler.
 3. The round baler of claim 1, wherein the one or more baleweight measurements are obtained during a wrap cycle of the formed bale.4. The round baler of claim 1, further comprising a tailgate closingswitch in communication with the tailgate, the tailgate closing switchconfigured to indicate when the tailgate is closed; wherein the one ormore empty baler weight measurements are obtained during a tailgateclose cycle.
 5. The round baler of claim 1, wherein the corrected baleweight is determined by adjusting the first bale weight based upon thefront-to-back angle and the side-to-side angle of the baler and the sizeof the bale; and wherein the size of the bale is a function of a centerof gravity location of the bale.
 6. A round baler comprising: a mainframe with a main support beam on which a pair of wheels are rotatableaffixed, each wheel comprising a wheel axle, the main frame including abale forming chamber in which a bale is formed; a tailgate pivotallyconnected to the main frame the tailgate configured to pivot open todischarge a formed bale; a single load sensor positioned at one of afirst wheel axle or a second wheel axle of the baler and positioned formeasuring a weight force exerted thereon, wherein the load sensorobtains the following measurements: one or more bale weight measurementsof the baler with a formed bale contained therein; and one or more emptybaler weight measurements of the baler empty; and a processing unitcoupled to the load sensor, the processing unit configured to calculatea weight of the bale by: determining a corrected bale weight byadjusting a first bale weight, the first bale weight a function of theone or more bale weight measurements and the one or more empty balerweight measurements; wherein the first bale weight is adjusted basedupon one or more of (i) one or more slopes on a surface on which thebaler is positioned: (ii) a size of the bale; and (iii) a shape of thebale, wherein the one or more slopes comprises one or more of afront-to-back angle and a side-to-side angle of the baler; aninclinometer in communication with the processing unit configured toobtain the front-to-back angle; and wherein the side-to-side angle isdetermined based upon the empty baler weight measurements in which thetailgate of the baler is in two known positions.
 7. The round baler ofclaim 6, wherein the corrected bale weight is determined by adjustingthe first bale weight based upon the front-to-back angle and theside-to-side angle of the baler, the size of the bale, and the shape ofthe bale; wherein the size of the bale is a function of a center ofgravity location of the bale; and wherein the shape of the bale is afunction of the density of the bale at more than one bale shape sensorpositioned in the baler.